Boots – shoes – and leggings
Patent
1981-11-27
1984-02-14
Zache, Raulfe B.
Boots, shoes, and leggings
364200, G06F 900
Patent
active
044320574
ABSTRACT:
A method for dynamic replication of data under distributed system control to control the utilization of resources in a multiprocessing, distributed data base system. Previously, systems providing for data replication at nodes of a multiprocessing, distributed data base system required that a central node maintain control, or that replicated data be synchronized by immediately conforming all copies of an updated data item. By this invention, requests for access to data of a specified currency are permitted and conformation of updated data is selectively deferred by use of a control procedure implemented at each node and utilizing a status and control (SAC) filed at each node which describes that node's view of the status for shared data items at other nodes.
REFERENCES:
patent: 4007450 (1977-02-01), Haibt et al.
patent: 4344134 (1982-08-01), Barnes
Bernstein, "The Concurrency Control Mechanism of SDD-1: A System for Distributed Databases (The Fully Redundant Case)", reprinted in W. W. Chu et al., Tutorial: Centralized and Distributed Data Base Systems, IEEE Computer Society, Presented Oct. 1-4, 1979, "Chapter 12. Synchronization and Concurrency Control of Multiple Copy Data Bases", at p. 516.
Ellis, "A Robust Algorithm for Updating Duplicate Data Bases", reprinted in W. W. Chu et al., supra, at p. 531.
Lewis, "A Distributed Data Control System", an unpublished, internal IBM memorandum; time stamped Oct. 24, 1978.
Daniell Thomas P.
Harding, Jr. Robert C.
Lewis Neil J.
Nauckhoff Sven H. H.
Beckstrand Shelley M.
International Business Machines - Corporation
Zache Raulfe B.
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